题解 | #序列发生器#
序列发生器
http://www.nowcoder.com/practice/1fe78a981bd640edb35b91d467341061
`timescale 1ns/1ns
module sequence_generator(
input clk,
input rst_n,
output reg data
);
parameter a = 3'b000, b=3'b001, c=3'b010, d=3'b011, e=3'b100, f=3'b101, idle=3'b111;
reg [2:0] sta, nsta;
always @(posedge clk or negedge rst_n) begin
if (!rst_n) begin
sta <= idle;
end else begin
sta <= nsta;
end
end
always @(*) begin
{data,nsta} = {1'b0,idle};
case (sta)
idle : {data,nsta} = {1'b0,a};
a : {data,nsta} = {1'b0,b};
b : {data,nsta} = {1'b0,c};
c : {data,nsta} = {1'b1,d};
d : {data,nsta} = {1'b0,e};
e : {data,nsta} = {1'b1,f};
f : {data,nsta} = {1'b1,a};
endcase
end
endmodule
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